Highly Disordered Fe-Doped CeO2 with Oxygen Vacancies Facilitates Electrocatalytic Water Oxidation

The practical application of electrocatalytic water splittingishindered by the sluggish anodic oxygen evolution reaction (OER), wherethe exploration of efficient and stable electrocatalysts toward wateroxidation remains a great challenge. Herein, we report an active iron-dopedceria (FeO x /CeO2) catalystwith a highly disordered feature decorated on three-dimensional (3D)nickel foam, which can directly serve as the superior OER electrodein alkaline media. The highly disordered Fe-doped CeO2 catalystdisplays remarkable OER performance with a low overpotential of 252mV to achieve 10 mA cm(-2), a small Tafel slope of45 mV dec(-1), and long-term durability for at least48 h with a stable structure. The superior OER activity of FeO x /CeO2 is attributed to the latticeoxygen activation mechanism facilitated by its disordered structureas well as the high electrochemical surface area. This study providesvaluable insights into the rational design of efficient OER catalyststhrough tailoring the catalyst structure and reaction pathway.